package com.mhy.netsafe.utils.reg;

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * @项目名 Storekeeper
 * @所在包 com.hcsoft.storekeeper.Reg
 * @作者 mahongyin
 * @时间 2019/2/22 10:40
 * @邮箱 mhy.work@qq.com
 * @描述 说明:MD5加密
 */
public class MD5 {

    /***
     * MD5加码 生成32位md5码
     */
    public static String string2MD5(String inStr) {
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (Exception e) {
            System.out.println(e.toString());
            e.printStackTrace();
            return "";
        }
        char[] charArray = inStr.toCharArray();
        byte[] byteArray = new byte[charArray.length];

        for (int i = 0; i < charArray.length; i++)
            byteArray[i] = (byte) charArray[i];
        byte[] md5Bytes = md5.digest(byteArray);
        StringBuffer hexValue = new StringBuffer();
        for (int i = 0; i < md5Bytes.length; i++) {
            int val = ((int) md5Bytes[i]) & 0xff;
            if (val < 16)
                hexValue.append("0");
            hexValue.append(Integer.toHexString(val));
        }
        return hexValue.toString();

    }

    /**
     * 加密解密算法 执行一次加密，两次解密
     */
    public static String convertMD5(String inStr) {

        char[] a = inStr.toCharArray();
        for (int i = 0; i < a.length; i++) {
            a[i] = (char) (a[i] ^ 't');
        }
        String s = new String(a);
        return s;

    }

    // 测试主函数
    public static void main(String args[]) {
        String s = new String("tangfuqiang");//???new？？？？？
        System.out.println("原始：" + s);
        System.out.println("MD5后：" + string2MD5(s));
        System.out.println("加密的：" + convertMD5(s));
        System.out.println("解密的：" + convertMD5(convertMD5(s)));

    }

  //单独加密方法  分大小写
public  String md5jia(String str) {
    MessageDigest md5 = null;
    try {
        md5 = MessageDigest.getInstance("MD5");
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    }
    md5.update((str).getBytes(StandardCharsets.UTF_8));//UTF-8
    byte b[] = md5.digest();

    int i;
    StringBuffer buf = new StringBuffer("");

    for (
            int offset = 0;
            offset < b.length; offset++) {
        i = b[offset];
        if (i < 0) {
            i += 256;
        }
        if (i < 16) {
            buf.append("0");
        }
        buf.append(Integer.toHexString(i));
    }
  return  buf.toString();//小写   、、大写 result =buf.toString().toUpperCase();   、、大转小.toLowerCase()

}
//大写32位：只需在buf.toString()后面加.toUpperCase()即可 result =buf.toString().toUpperCase();
}